1 /* 2 * Wi-Fi Protected Setup - Enrollee 3 * Copyright (c) 2008, Jouni Malinen <j (at) w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 #include "crypto/crypto.h" 19 #include "crypto/sha256.h" 20 #include "crypto/random.h" 21 #include "wps_i.h" 22 #include "wps_dev_attr.h" 23 24 25 static int wps_build_mac_addr(struct wps_data *wps, struct wpabuf *msg) 26 { 27 wpa_printf(MSG_DEBUG, "WPS: * MAC Address"); 28 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 29 wpabuf_put_be16(msg, ETH_ALEN); 30 wpabuf_put_data(msg, wps->mac_addr_e, ETH_ALEN); 31 return 0; 32 } 33 34 35 static int wps_build_wps_state(struct wps_data *wps, struct wpabuf *msg) 36 { 37 u8 state; 38 if (wps->wps->ap) 39 state = wps->wps->wps_state; 40 else 41 state = WPS_STATE_NOT_CONFIGURED; 42 wpa_printf(MSG_DEBUG, "WPS: * Wi-Fi Protected Setup State (%d)", 43 state); 44 wpabuf_put_be16(msg, ATTR_WPS_STATE); 45 wpabuf_put_be16(msg, 1); 46 wpabuf_put_u8(msg, state); 47 return 0; 48 } 49 50 51 static int wps_build_e_hash(struct wps_data *wps, struct wpabuf *msg) 52 { 53 u8 *hash; 54 const u8 *addr[4]; 55 size_t len[4]; 56 57 if (random_get_bytes(wps->snonce, 2 * WPS_SECRET_NONCE_LEN) < 0) 58 return -1; 59 wpa_hexdump(MSG_DEBUG, "WPS: E-S1", wps->snonce, WPS_SECRET_NONCE_LEN); 60 wpa_hexdump(MSG_DEBUG, "WPS: E-S2", 61 wps->snonce + WPS_SECRET_NONCE_LEN, WPS_SECRET_NONCE_LEN); 62 63 if (wps->dh_pubkey_e == NULL || wps->dh_pubkey_r == NULL) { 64 wpa_printf(MSG_DEBUG, "WPS: DH public keys not available for " 65 "E-Hash derivation"); 66 return -1; 67 } 68 69 wpa_printf(MSG_DEBUG, "WPS: * E-Hash1"); 70 wpabuf_put_be16(msg, ATTR_E_HASH1); 71 wpabuf_put_be16(msg, SHA256_MAC_LEN); 72 hash = wpabuf_put(msg, SHA256_MAC_LEN); 73 /* E-Hash1 = HMAC_AuthKey(E-S1 || PSK1 || PK_E || PK_R) */ 74 addr[0] = wps->snonce; 75 len[0] = WPS_SECRET_NONCE_LEN; 76 addr[1] = wps->psk1; 77 len[1] = WPS_PSK_LEN; 78 addr[2] = wpabuf_head(wps->dh_pubkey_e); 79 len[2] = wpabuf_len(wps->dh_pubkey_e); 80 addr[3] = wpabuf_head(wps->dh_pubkey_r); 81 len[3] = wpabuf_len(wps->dh_pubkey_r); 82 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 83 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash1", hash, SHA256_MAC_LEN); 84 85 wpa_printf(MSG_DEBUG, "WPS: * E-Hash2"); 86 wpabuf_put_be16(msg, ATTR_E_HASH2); 87 wpabuf_put_be16(msg, SHA256_MAC_LEN); 88 hash = wpabuf_put(msg, SHA256_MAC_LEN); 89 /* E-Hash2 = HMAC_AuthKey(E-S2 || PSK2 || PK_E || PK_R) */ 90 addr[0] = wps->snonce + WPS_SECRET_NONCE_LEN; 91 addr[1] = wps->psk2; 92 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 93 wpa_hexdump(MSG_DEBUG, "WPS: E-Hash2", hash, SHA256_MAC_LEN); 94 95 return 0; 96 } 97 98 99 static int wps_build_e_snonce1(struct wps_data *wps, struct wpabuf *msg) 100 { 101 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce1"); 102 wpabuf_put_be16(msg, ATTR_E_SNONCE1); 103 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 104 wpabuf_put_data(msg, wps->snonce, WPS_SECRET_NONCE_LEN); 105 return 0; 106 } 107 108 109 static int wps_build_e_snonce2(struct wps_data *wps, struct wpabuf *msg) 110 { 111 wpa_printf(MSG_DEBUG, "WPS: * E-SNonce2"); 112 wpabuf_put_be16(msg, ATTR_E_SNONCE2); 113 wpabuf_put_be16(msg, WPS_SECRET_NONCE_LEN); 114 wpabuf_put_data(msg, wps->snonce + WPS_SECRET_NONCE_LEN, 115 WPS_SECRET_NONCE_LEN); 116 return 0; 117 } 118 119 120 static struct wpabuf * wps_build_m1(struct wps_data *wps) 121 { 122 struct wpabuf *msg; 123 u16 config_methods; 124 125 if (random_get_bytes(wps->nonce_e, WPS_NONCE_LEN) < 0) 126 return NULL; 127 wpa_hexdump(MSG_DEBUG, "WPS: Enrollee Nonce", 128 wps->nonce_e, WPS_NONCE_LEN); 129 130 wpa_printf(MSG_DEBUG, "WPS: Building Message M1"); 131 msg = wpabuf_alloc(1000); 132 if (msg == NULL) 133 return NULL; 134 135 config_methods = wps->wps->config_methods; 136 if (wps->wps->ap && !wps->pbc_in_m1 && 137 (wps->dev_password_len != 0 || 138 (config_methods & WPS_CONFIG_DISPLAY))) { 139 /* 140 * These are the methods that the AP supports as an Enrollee 141 * for adding external Registrars, so remove PushButton. 142 * 143 * As a workaround for Windows 7 mechanism for probing WPS 144 * capabilities from M1, leave PushButton option if no PIN 145 * method is available or if WPS configuration enables PBC 146 * workaround. 147 */ 148 config_methods &= ~WPS_CONFIG_PUSHBUTTON; 149 #ifdef CONFIG_WPS2 150 config_methods &= ~(WPS_CONFIG_VIRT_PUSHBUTTON | 151 WPS_CONFIG_PHY_PUSHBUTTON); 152 #endif /* CONFIG_WPS2 */ 153 } 154 155 if (wps_build_version(msg) || 156 wps_build_msg_type(msg, WPS_M1) || 157 wps_build_uuid_e(msg, wps->uuid_e) || 158 wps_build_mac_addr(wps, msg) || 159 wps_build_enrollee_nonce(wps, msg) || 160 wps_build_public_key(wps, msg) || 161 wps_build_auth_type_flags(wps, msg) || 162 wps_build_encr_type_flags(wps, msg) || 163 wps_build_conn_type_flags(wps, msg) || 164 wps_build_config_methods(msg, config_methods) || 165 wps_build_wps_state(wps, msg) || 166 wps_build_device_attrs(&wps->wps->dev, msg) || 167 wps_build_rf_bands(&wps->wps->dev, msg) || 168 wps_build_assoc_state(wps, msg) || 169 wps_build_dev_password_id(msg, wps->dev_pw_id) || 170 wps_build_config_error(msg, WPS_CFG_NO_ERROR) || 171 wps_build_os_version(&wps->wps->dev, msg) || 172 wps_build_wfa_ext(msg, 0, NULL, 0)) { 173 wpabuf_free(msg); 174 return NULL; 175 } 176 177 wps->state = RECV_M2; 178 return msg; 179 } 180 181 182 static struct wpabuf * wps_build_m3(struct wps_data *wps) 183 { 184 struct wpabuf *msg; 185 186 wpa_printf(MSG_DEBUG, "WPS: Building Message M3"); 187 188 if (wps->dev_password == NULL) { 189 wpa_printf(MSG_DEBUG, "WPS: No Device Password available"); 190 return NULL; 191 } 192 wps_derive_psk(wps, wps->dev_password, wps->dev_password_len); 193 194 msg = wpabuf_alloc(1000); 195 if (msg == NULL) 196 return NULL; 197 198 if (wps_build_version(msg) || 199 wps_build_msg_type(msg, WPS_M3) || 200 wps_build_registrar_nonce(wps, msg) || 201 wps_build_e_hash(wps, msg) || 202 wps_build_wfa_ext(msg, 0, NULL, 0) || 203 wps_build_authenticator(wps, msg)) { 204 wpabuf_free(msg); 205 return NULL; 206 } 207 208 wps->state = RECV_M4; 209 return msg; 210 } 211 212 213 static struct wpabuf * wps_build_m5(struct wps_data *wps) 214 { 215 struct wpabuf *msg, *plain; 216 217 wpa_printf(MSG_DEBUG, "WPS: Building Message M5"); 218 219 plain = wpabuf_alloc(200); 220 if (plain == NULL) 221 return NULL; 222 223 msg = wpabuf_alloc(1000); 224 if (msg == NULL) { 225 wpabuf_free(plain); 226 return NULL; 227 } 228 229 if (wps_build_version(msg) || 230 wps_build_msg_type(msg, WPS_M5) || 231 wps_build_registrar_nonce(wps, msg) || 232 wps_build_e_snonce1(wps, plain) || 233 wps_build_key_wrap_auth(wps, plain) || 234 wps_build_encr_settings(wps, msg, plain) || 235 wps_build_wfa_ext(msg, 0, NULL, 0) || 236 wps_build_authenticator(wps, msg)) { 237 wpabuf_free(plain); 238 wpabuf_free(msg); 239 return NULL; 240 } 241 wpabuf_free(plain); 242 243 wps->state = RECV_M6; 244 return msg; 245 } 246 247 248 static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg) 249 { 250 wpa_printf(MSG_DEBUG, "WPS: * SSID"); 251 wpabuf_put_be16(msg, ATTR_SSID); 252 wpabuf_put_be16(msg, wps->wps->ssid_len); 253 wpabuf_put_data(msg, wps->wps->ssid, wps->wps->ssid_len); 254 return 0; 255 } 256 257 258 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg) 259 { 260 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type"); 261 wpabuf_put_be16(msg, ATTR_AUTH_TYPE); 262 wpabuf_put_be16(msg, 2); 263 wpabuf_put_be16(msg, wps->wps->auth_types); 264 return 0; 265 } 266 267 268 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg) 269 { 270 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type"); 271 wpabuf_put_be16(msg, ATTR_ENCR_TYPE); 272 wpabuf_put_be16(msg, 2); 273 wpabuf_put_be16(msg, wps->wps->encr_types); 274 return 0; 275 } 276 277 278 static int wps_build_cred_network_key(struct wps_data *wps, struct wpabuf *msg) 279 { 280 wpa_printf(MSG_DEBUG, "WPS: * Network Key"); 281 wpabuf_put_be16(msg, ATTR_NETWORK_KEY); 282 wpabuf_put_be16(msg, wps->wps->network_key_len); 283 wpabuf_put_data(msg, wps->wps->network_key, wps->wps->network_key_len); 284 return 0; 285 } 286 287 288 static int wps_build_cred_mac_addr(struct wps_data *wps, struct wpabuf *msg) 289 { 290 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (AP BSSID)"); 291 wpabuf_put_be16(msg, ATTR_MAC_ADDR); 292 wpabuf_put_be16(msg, ETH_ALEN); 293 wpabuf_put_data(msg, wps->wps->dev.mac_addr, ETH_ALEN); 294 return 0; 295 } 296 297 298 static int wps_build_ap_settings(struct wps_data *wps, struct wpabuf *plain) 299 { 300 if (wps->wps->ap_settings) { 301 wpa_printf(MSG_DEBUG, "WPS: * AP Settings (pre-configured)"); 302 wpabuf_put_data(plain, wps->wps->ap_settings, 303 wps->wps->ap_settings_len); 304 return 0; 305 } 306 307 return wps_build_cred_ssid(wps, plain) || 308 wps_build_cred_mac_addr(wps, plain) || 309 wps_build_cred_auth_type(wps, plain) || 310 wps_build_cred_encr_type(wps, plain) || 311 wps_build_cred_network_key(wps, plain); 312 } 313 314 315 static struct wpabuf * wps_build_m7(struct wps_data *wps) 316 { 317 struct wpabuf *msg, *plain; 318 319 wpa_printf(MSG_DEBUG, "WPS: Building Message M7"); 320 321 plain = wpabuf_alloc(500 + wps->wps->ap_settings_len); 322 if (plain == NULL) 323 return NULL; 324 325 msg = wpabuf_alloc(1000 + wps->wps->ap_settings_len); 326 if (msg == NULL) { 327 wpabuf_free(plain); 328 return NULL; 329 } 330 331 if (wps_build_version(msg) || 332 wps_build_msg_type(msg, WPS_M7) || 333 wps_build_registrar_nonce(wps, msg) || 334 wps_build_e_snonce2(wps, plain) || 335 (wps->wps->ap && wps_build_ap_settings(wps, plain)) || 336 wps_build_key_wrap_auth(wps, plain) || 337 wps_build_encr_settings(wps, msg, plain) || 338 wps_build_wfa_ext(msg, 0, NULL, 0) || 339 wps_build_authenticator(wps, msg)) { 340 wpabuf_free(plain); 341 wpabuf_free(msg); 342 return NULL; 343 } 344 wpabuf_free(plain); 345 346 if (wps->wps->ap && wps->wps->registrar) { 347 /* 348 * If the Registrar is only learning our current configuration, 349 * it may not continue protocol run to successful completion. 350 * Store information here to make sure it remains available. 351 */ 352 wps_device_store(wps->wps->registrar, &wps->peer_dev, 353 wps->uuid_r); 354 } 355 356 wps->state = RECV_M8; 357 return msg; 358 } 359 360 361 static struct wpabuf * wps_build_wsc_done(struct wps_data *wps) 362 { 363 struct wpabuf *msg; 364 365 wpa_printf(MSG_DEBUG, "WPS: Building Message WSC_Done"); 366 367 msg = wpabuf_alloc(1000); 368 if (msg == NULL) 369 return NULL; 370 371 if (wps_build_version(msg) || 372 wps_build_msg_type(msg, WPS_WSC_DONE) || 373 wps_build_enrollee_nonce(wps, msg) || 374 wps_build_registrar_nonce(wps, msg) || 375 wps_build_wfa_ext(msg, 0, NULL, 0)) { 376 wpabuf_free(msg); 377 return NULL; 378 } 379 380 if (wps->wps->ap) 381 wps->state = RECV_ACK; 382 else { 383 wps_success_event(wps->wps); 384 wps->state = WPS_FINISHED; 385 } 386 return msg; 387 } 388 389 390 struct wpabuf * wps_enrollee_get_msg(struct wps_data *wps, 391 enum wsc_op_code *op_code) 392 { 393 struct wpabuf *msg; 394 395 switch (wps->state) { 396 case SEND_M1: 397 msg = wps_build_m1(wps); 398 *op_code = WSC_MSG; 399 break; 400 case SEND_M3: 401 msg = wps_build_m3(wps); 402 *op_code = WSC_MSG; 403 break; 404 case SEND_M5: 405 msg = wps_build_m5(wps); 406 *op_code = WSC_MSG; 407 break; 408 case SEND_M7: 409 msg = wps_build_m7(wps); 410 *op_code = WSC_MSG; 411 break; 412 case RECEIVED_M2D: 413 if (wps->wps->ap) { 414 msg = wps_build_wsc_nack(wps); 415 *op_code = WSC_NACK; 416 break; 417 } 418 msg = wps_build_wsc_ack(wps); 419 *op_code = WSC_ACK; 420 if (msg) { 421 /* Another M2/M2D may be received */ 422 wps->state = RECV_M2; 423 } 424 break; 425 case SEND_WSC_NACK: 426 msg = wps_build_wsc_nack(wps); 427 *op_code = WSC_NACK; 428 break; 429 case WPS_MSG_DONE: 430 msg = wps_build_wsc_done(wps); 431 *op_code = WSC_Done; 432 break; 433 default: 434 wpa_printf(MSG_DEBUG, "WPS: Unsupported state %d for building " 435 "a message", wps->state); 436 msg = NULL; 437 break; 438 } 439 440 if (*op_code == WSC_MSG && msg) { 441 /* Save a copy of the last message for Authenticator derivation 442 */ 443 wpabuf_free(wps->last_msg); 444 wps->last_msg = wpabuf_dup(msg); 445 } 446 447 return msg; 448 } 449 450 451 static int wps_process_registrar_nonce(struct wps_data *wps, const u8 *r_nonce) 452 { 453 if (r_nonce == NULL) { 454 wpa_printf(MSG_DEBUG, "WPS: No Registrar Nonce received"); 455 return -1; 456 } 457 458 os_memcpy(wps->nonce_r, r_nonce, WPS_NONCE_LEN); 459 wpa_hexdump(MSG_DEBUG, "WPS: Registrar Nonce", 460 wps->nonce_r, WPS_NONCE_LEN); 461 462 return 0; 463 } 464 465 466 static int wps_process_enrollee_nonce(struct wps_data *wps, const u8 *e_nonce) 467 { 468 if (e_nonce == NULL) { 469 wpa_printf(MSG_DEBUG, "WPS: No Enrollee Nonce received"); 470 return -1; 471 } 472 473 if (os_memcmp(wps->nonce_e, e_nonce, WPS_NONCE_LEN) != 0) { 474 wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce received"); 475 return -1; 476 } 477 478 return 0; 479 } 480 481 482 static int wps_process_uuid_r(struct wps_data *wps, const u8 *uuid_r) 483 { 484 if (uuid_r == NULL) { 485 wpa_printf(MSG_DEBUG, "WPS: No UUID-R received"); 486 return -1; 487 } 488 489 os_memcpy(wps->uuid_r, uuid_r, WPS_UUID_LEN); 490 wpa_hexdump(MSG_DEBUG, "WPS: UUID-R", wps->uuid_r, WPS_UUID_LEN); 491 492 return 0; 493 } 494 495 496 static int wps_process_pubkey(struct wps_data *wps, const u8 *pk, 497 size_t pk_len) 498 { 499 if (pk == NULL || pk_len == 0) { 500 wpa_printf(MSG_DEBUG, "WPS: No Public Key received"); 501 return -1; 502 } 503 504 #ifdef CONFIG_WPS_OOB 505 if (wps->dev_pw_id != DEV_PW_DEFAULT && 506 wps->wps->oob_conf.pubkey_hash) { 507 const u8 *addr[1]; 508 u8 hash[WPS_HASH_LEN]; 509 510 addr[0] = pk; 511 sha256_vector(1, addr, &pk_len, hash); 512 if (os_memcmp(hash, 513 wpabuf_head(wps->wps->oob_conf.pubkey_hash), 514 WPS_OOB_PUBKEY_HASH_LEN) != 0) { 515 wpa_printf(MSG_ERROR, "WPS: Public Key hash error"); 516 return -1; 517 } 518 } 519 #endif /* CONFIG_WPS_OOB */ 520 521 wpabuf_free(wps->dh_pubkey_r); 522 wps->dh_pubkey_r = wpabuf_alloc_copy(pk, pk_len); 523 if (wps->dh_pubkey_r == NULL) 524 return -1; 525 526 if (wps_derive_keys(wps) < 0) 527 return -1; 528 529 return 0; 530 } 531 532 533 static int wps_process_r_hash1(struct wps_data *wps, const u8 *r_hash1) 534 { 535 if (r_hash1 == NULL) { 536 wpa_printf(MSG_DEBUG, "WPS: No R-Hash1 received"); 537 return -1; 538 } 539 540 os_memcpy(wps->peer_hash1, r_hash1, WPS_HASH_LEN); 541 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash1", wps->peer_hash1, WPS_HASH_LEN); 542 543 return 0; 544 } 545 546 547 static int wps_process_r_hash2(struct wps_data *wps, const u8 *r_hash2) 548 { 549 if (r_hash2 == NULL) { 550 wpa_printf(MSG_DEBUG, "WPS: No R-Hash2 received"); 551 return -1; 552 } 553 554 os_memcpy(wps->peer_hash2, r_hash2, WPS_HASH_LEN); 555 wpa_hexdump(MSG_DEBUG, "WPS: R-Hash2", wps->peer_hash2, WPS_HASH_LEN); 556 557 return 0; 558 } 559 560 561 static int wps_process_r_snonce1(struct wps_data *wps, const u8 *r_snonce1) 562 { 563 u8 hash[SHA256_MAC_LEN]; 564 const u8 *addr[4]; 565 size_t len[4]; 566 567 if (r_snonce1 == NULL) { 568 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce1 received"); 569 return -1; 570 } 571 572 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce1", r_snonce1, 573 WPS_SECRET_NONCE_LEN); 574 575 /* R-Hash1 = HMAC_AuthKey(R-S1 || PSK1 || PK_E || PK_R) */ 576 addr[0] = r_snonce1; 577 len[0] = WPS_SECRET_NONCE_LEN; 578 addr[1] = wps->psk1; 579 len[1] = WPS_PSK_LEN; 580 addr[2] = wpabuf_head(wps->dh_pubkey_e); 581 len[2] = wpabuf_len(wps->dh_pubkey_e); 582 addr[3] = wpabuf_head(wps->dh_pubkey_r); 583 len[3] = wpabuf_len(wps->dh_pubkey_r); 584 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 585 586 if (os_memcmp(wps->peer_hash1, hash, WPS_HASH_LEN) != 0) { 587 wpa_printf(MSG_DEBUG, "WPS: R-Hash1 derived from R-S1 does " 588 "not match with the pre-committed value"); 589 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 590 wps_pwd_auth_fail_event(wps->wps, 1, 1); 591 return -1; 592 } 593 594 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the first " 595 "half of the device password"); 596 597 return 0; 598 } 599 600 601 static int wps_process_r_snonce2(struct wps_data *wps, const u8 *r_snonce2) 602 { 603 u8 hash[SHA256_MAC_LEN]; 604 const u8 *addr[4]; 605 size_t len[4]; 606 607 if (r_snonce2 == NULL) { 608 wpa_printf(MSG_DEBUG, "WPS: No R-SNonce2 received"); 609 return -1; 610 } 611 612 wpa_hexdump_key(MSG_DEBUG, "WPS: R-SNonce2", r_snonce2, 613 WPS_SECRET_NONCE_LEN); 614 615 /* R-Hash2 = HMAC_AuthKey(R-S2 || PSK2 || PK_E || PK_R) */ 616 addr[0] = r_snonce2; 617 len[0] = WPS_SECRET_NONCE_LEN; 618 addr[1] = wps->psk2; 619 len[1] = WPS_PSK_LEN; 620 addr[2] = wpabuf_head(wps->dh_pubkey_e); 621 len[2] = wpabuf_len(wps->dh_pubkey_e); 622 addr[3] = wpabuf_head(wps->dh_pubkey_r); 623 len[3] = wpabuf_len(wps->dh_pubkey_r); 624 hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 4, addr, len, hash); 625 626 if (os_memcmp(wps->peer_hash2, hash, WPS_HASH_LEN) != 0) { 627 wpa_printf(MSG_DEBUG, "WPS: R-Hash2 derived from R-S2 does " 628 "not match with the pre-committed value"); 629 wps->config_error = WPS_CFG_DEV_PASSWORD_AUTH_FAILURE; 630 wps_pwd_auth_fail_event(wps->wps, 1, 2); 631 return -1; 632 } 633 634 wpa_printf(MSG_DEBUG, "WPS: Registrar proved knowledge of the second " 635 "half of the device password"); 636 637 return 0; 638 } 639 640 641 static int wps_process_cred_e(struct wps_data *wps, const u8 *cred, 642 size_t cred_len, int wps2) 643 { 644 struct wps_parse_attr attr; 645 struct wpabuf msg; 646 647 wpa_printf(MSG_DEBUG, "WPS: Received Credential"); 648 os_memset(&wps->cred, 0, sizeof(wps->cred)); 649 wpabuf_set(&msg, cred, cred_len); 650 if (wps_parse_msg(&msg, &attr) < 0 || 651 wps_process_cred(&attr, &wps->cred)) 652 return -1; 653 654 if (os_memcmp(wps->cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 655 0) { 656 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the Credential (" 657 MACSTR ") does not match with own address (" MACSTR 658 ")", MAC2STR(wps->cred.mac_addr), 659 MAC2STR(wps->wps->dev.mac_addr)); 660 /* 661 * In theory, this could be consider fatal error, but there are 662 * number of deployed implementations using other address here 663 * due to unclarity in the specification. For interoperability 664 * reasons, allow this to be processed since we do not really 665 * use the MAC Address information for anything. 666 */ 667 #ifdef CONFIG_WPS_STRICT 668 if (wps2) { 669 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 670 "MAC Address in AP Settings"); 671 return -1; 672 } 673 #endif /* CONFIG_WPS_STRICT */ 674 } 675 676 #ifdef CONFIG_WPS2 677 if (!(wps->cred.encr_type & 678 (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) { 679 if (wps->cred.encr_type & WPS_ENCR_WEP) { 680 wpa_printf(MSG_INFO, "WPS: Reject Credential " 681 "due to WEP configuration"); 682 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 683 return -2; 684 } 685 686 wpa_printf(MSG_INFO, "WPS: Reject Credential due to " 687 "invalid encr_type 0x%x", wps->cred.encr_type); 688 return -1; 689 } 690 #endif /* CONFIG_WPS2 */ 691 692 if (wps->wps->cred_cb) { 693 wps->cred.cred_attr = cred - 4; 694 wps->cred.cred_attr_len = cred_len + 4; 695 wps->wps->cred_cb(wps->wps->cb_ctx, &wps->cred); 696 wps->cred.cred_attr = NULL; 697 wps->cred.cred_attr_len = 0; 698 } 699 700 return 0; 701 } 702 703 704 static int wps_process_creds(struct wps_data *wps, const u8 *cred[], 705 size_t cred_len[], size_t num_cred, int wps2) 706 { 707 size_t i; 708 int ok = 0; 709 710 if (wps->wps->ap) 711 return 0; 712 713 if (num_cred == 0) { 714 wpa_printf(MSG_DEBUG, "WPS: No Credential attributes " 715 "received"); 716 return -1; 717 } 718 719 for (i = 0; i < num_cred; i++) { 720 int res; 721 res = wps_process_cred_e(wps, cred[i], cred_len[i], wps2); 722 if (res == 0) 723 ok++; 724 else if (res == -2) 725 wpa_printf(MSG_DEBUG, "WPS: WEP credential skipped"); 726 else 727 return -1; 728 } 729 730 if (ok == 0) { 731 wpa_printf(MSG_DEBUG, "WPS: No valid Credential attribute " 732 "received"); 733 return -1; 734 } 735 736 return 0; 737 } 738 739 740 static int wps_process_ap_settings_e(struct wps_data *wps, 741 struct wps_parse_attr *attr, 742 struct wpabuf *attrs, int wps2) 743 { 744 struct wps_credential cred; 745 746 if (!wps->wps->ap) 747 return 0; 748 749 if (wps_process_ap_settings(attr, &cred) < 0) 750 return -1; 751 752 wpa_printf(MSG_INFO, "WPS: Received new AP configuration from " 753 "Registrar"); 754 755 if (os_memcmp(cred.mac_addr, wps->wps->dev.mac_addr, ETH_ALEN) != 756 0) { 757 wpa_printf(MSG_DEBUG, "WPS: MAC Address in the AP Settings (" 758 MACSTR ") does not match with own address (" MACSTR 759 ")", MAC2STR(cred.mac_addr), 760 MAC2STR(wps->wps->dev.mac_addr)); 761 /* 762 * In theory, this could be consider fatal error, but there are 763 * number of deployed implementations using other address here 764 * due to unclarity in the specification. For interoperability 765 * reasons, allow this to be processed since we do not really 766 * use the MAC Address information for anything. 767 */ 768 #ifdef CONFIG_WPS_STRICT 769 if (wps2) { 770 wpa_printf(MSG_INFO, "WPS: Do not accept incorrect " 771 "MAC Address in AP Settings"); 772 return -1; 773 } 774 #endif /* CONFIG_WPS_STRICT */ 775 } 776 777 #ifdef CONFIG_WPS2 778 if (!(cred.encr_type & (WPS_ENCR_NONE | WPS_ENCR_TKIP | WPS_ENCR_AES))) 779 { 780 if (cred.encr_type & WPS_ENCR_WEP) { 781 wpa_printf(MSG_INFO, "WPS: Reject new AP settings " 782 "due to WEP configuration"); 783 wps->error_indication = WPS_EI_SECURITY_WEP_PROHIBITED; 784 return -1; 785 } 786 787 wpa_printf(MSG_INFO, "WPS: Reject new AP settings due to " 788 "invalid encr_type 0x%x", cred.encr_type); 789 return -1; 790 } 791 #endif /* CONFIG_WPS2 */ 792 793 #ifdef CONFIG_WPS_STRICT 794 if (wps2) { 795 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == 796 WPS_ENCR_TKIP || 797 (cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 798 WPS_AUTH_WPAPSK) { 799 wpa_printf(MSG_INFO, "WPS-STRICT: Invalid WSC 2.0 " 800 "AP Settings: WPA-Personal/TKIP only"); 801 wps->error_indication = 802 WPS_EI_SECURITY_TKIP_ONLY_PROHIBITED; 803 return -1; 804 } 805 } 806 #endif /* CONFIG_WPS_STRICT */ 807 808 #ifdef CONFIG_WPS2 809 if ((cred.encr_type & (WPS_ENCR_TKIP | WPS_ENCR_AES)) == WPS_ENCR_TKIP) 810 { 811 wpa_printf(MSG_DEBUG, "WPS: Upgrade encr_type TKIP -> " 812 "TKIP+AES"); 813 cred.encr_type |= WPS_ENCR_AES; 814 } 815 816 if ((cred.auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK)) == 817 WPS_AUTH_WPAPSK) { 818 wpa_printf(MSG_DEBUG, "WPS: Upgrade auth_type WPAPSK -> " 819 "WPAPSK+WPA2PSK"); 820 cred.auth_type |= WPS_AUTH_WPA2PSK; 821 } 822 #endif /* CONFIG_WPS2 */ 823 824 if (wps->wps->cred_cb) { 825 cred.cred_attr = wpabuf_head(attrs); 826 cred.cred_attr_len = wpabuf_len(attrs); 827 wps->wps->cred_cb(wps->wps->cb_ctx, &cred); 828 } 829 830 return 0; 831 } 832 833 834 static enum wps_process_res wps_process_m2(struct wps_data *wps, 835 const struct wpabuf *msg, 836 struct wps_parse_attr *attr) 837 { 838 wpa_printf(MSG_DEBUG, "WPS: Received M2"); 839 840 if (wps->state != RECV_M2) { 841 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 842 "receiving M2", wps->state); 843 wps->state = SEND_WSC_NACK; 844 return WPS_CONTINUE; 845 } 846 847 if (wps_process_registrar_nonce(wps, attr->registrar_nonce) || 848 wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 849 wps_process_uuid_r(wps, attr->uuid_r)) { 850 wps->state = SEND_WSC_NACK; 851 return WPS_CONTINUE; 852 } 853 854 /* 855 * Stop here on an AP as an Enrollee if AP Setup is locked unless the 856 * special locked mode is used to allow protocol run up to M7 in order 857 * to support external Registrars that only learn the current AP 858 * configuration without changing it. 859 */ 860 if (wps->wps->ap && 861 ((wps->wps->ap_setup_locked && wps->wps->ap_setup_locked != 2) || 862 wps->dev_password == NULL)) { 863 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 864 "registration of a new Registrar"); 865 wps->config_error = WPS_CFG_SETUP_LOCKED; 866 wps->state = SEND_WSC_NACK; 867 return WPS_CONTINUE; 868 } 869 870 if (wps_process_pubkey(wps, attr->public_key, attr->public_key_len) || 871 wps_process_authenticator(wps, attr->authenticator, msg) || 872 wps_process_device_attrs(&wps->peer_dev, attr)) { 873 wps->state = SEND_WSC_NACK; 874 return WPS_CONTINUE; 875 } 876 877 wps->state = SEND_M3; 878 return WPS_CONTINUE; 879 } 880 881 882 static enum wps_process_res wps_process_m2d(struct wps_data *wps, 883 struct wps_parse_attr *attr) 884 { 885 wpa_printf(MSG_DEBUG, "WPS: Received M2D"); 886 887 if (wps->state != RECV_M2) { 888 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 889 "receiving M2D", wps->state); 890 wps->state = SEND_WSC_NACK; 891 return WPS_CONTINUE; 892 } 893 894 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Manufacturer", 895 attr->manufacturer, attr->manufacturer_len); 896 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Name", 897 attr->model_name, attr->model_name_len); 898 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Model Number", 899 attr->model_number, attr->model_number_len); 900 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Serial Number", 901 attr->serial_number, attr->serial_number_len); 902 wpa_hexdump_ascii(MSG_DEBUG, "WPS: Device Name", 903 attr->dev_name, attr->dev_name_len); 904 905 if (wps->wps->event_cb) { 906 union wps_event_data data; 907 struct wps_event_m2d *m2d = &data.m2d; 908 os_memset(&data, 0, sizeof(data)); 909 if (attr->config_methods) 910 m2d->config_methods = 911 WPA_GET_BE16(attr->config_methods); 912 m2d->manufacturer = attr->manufacturer; 913 m2d->manufacturer_len = attr->manufacturer_len; 914 m2d->model_name = attr->model_name; 915 m2d->model_name_len = attr->model_name_len; 916 m2d->model_number = attr->model_number; 917 m2d->model_number_len = attr->model_number_len; 918 m2d->serial_number = attr->serial_number; 919 m2d->serial_number_len = attr->serial_number_len; 920 m2d->dev_name = attr->dev_name; 921 m2d->dev_name_len = attr->dev_name_len; 922 m2d->primary_dev_type = attr->primary_dev_type; 923 if (attr->config_error) 924 m2d->config_error = 925 WPA_GET_BE16(attr->config_error); 926 if (attr->dev_password_id) 927 m2d->dev_password_id = 928 WPA_GET_BE16(attr->dev_password_id); 929 wps->wps->event_cb(wps->wps->cb_ctx, WPS_EV_M2D, &data); 930 } 931 932 wps->state = RECEIVED_M2D; 933 return WPS_CONTINUE; 934 } 935 936 937 static enum wps_process_res wps_process_m4(struct wps_data *wps, 938 const struct wpabuf *msg, 939 struct wps_parse_attr *attr) 940 { 941 struct wpabuf *decrypted; 942 struct wps_parse_attr eattr; 943 944 wpa_printf(MSG_DEBUG, "WPS: Received M4"); 945 946 if (wps->state != RECV_M4) { 947 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 948 "receiving M4", wps->state); 949 wps->state = SEND_WSC_NACK; 950 return WPS_CONTINUE; 951 } 952 953 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 954 wps_process_authenticator(wps, attr->authenticator, msg) || 955 wps_process_r_hash1(wps, attr->r_hash1) || 956 wps_process_r_hash2(wps, attr->r_hash2)) { 957 wps->state = SEND_WSC_NACK; 958 return WPS_CONTINUE; 959 } 960 961 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 962 attr->encr_settings_len); 963 if (decrypted == NULL) { 964 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 965 "Settings attribute"); 966 wps->state = SEND_WSC_NACK; 967 return WPS_CONTINUE; 968 } 969 970 if (wps_validate_m4_encr(decrypted, attr->version2 != 0) < 0) { 971 wpabuf_free(decrypted); 972 wps->state = SEND_WSC_NACK; 973 return WPS_CONTINUE; 974 } 975 976 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 977 "attribute"); 978 if (wps_parse_msg(decrypted, &eattr) < 0 || 979 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 980 wps_process_r_snonce1(wps, eattr.r_snonce1)) { 981 wpabuf_free(decrypted); 982 wps->state = SEND_WSC_NACK; 983 return WPS_CONTINUE; 984 } 985 wpabuf_free(decrypted); 986 987 wps->state = SEND_M5; 988 return WPS_CONTINUE; 989 } 990 991 992 static enum wps_process_res wps_process_m6(struct wps_data *wps, 993 const struct wpabuf *msg, 994 struct wps_parse_attr *attr) 995 { 996 struct wpabuf *decrypted; 997 struct wps_parse_attr eattr; 998 999 wpa_printf(MSG_DEBUG, "WPS: Received M6"); 1000 1001 if (wps->state != RECV_M6) { 1002 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1003 "receiving M6", wps->state); 1004 wps->state = SEND_WSC_NACK; 1005 return WPS_CONTINUE; 1006 } 1007 1008 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1009 wps_process_authenticator(wps, attr->authenticator, msg)) { 1010 wps->state = SEND_WSC_NACK; 1011 return WPS_CONTINUE; 1012 } 1013 1014 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1015 attr->encr_settings_len); 1016 if (decrypted == NULL) { 1017 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1018 "Settings attribute"); 1019 wps->state = SEND_WSC_NACK; 1020 return WPS_CONTINUE; 1021 } 1022 1023 if (wps_validate_m6_encr(decrypted, attr->version2 != 0) < 0) { 1024 wpabuf_free(decrypted); 1025 wps->state = SEND_WSC_NACK; 1026 return WPS_CONTINUE; 1027 } 1028 1029 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1030 "attribute"); 1031 if (wps_parse_msg(decrypted, &eattr) < 0 || 1032 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1033 wps_process_r_snonce2(wps, eattr.r_snonce2)) { 1034 wpabuf_free(decrypted); 1035 wps->state = SEND_WSC_NACK; 1036 return WPS_CONTINUE; 1037 } 1038 wpabuf_free(decrypted); 1039 1040 wps->state = SEND_M7; 1041 return WPS_CONTINUE; 1042 } 1043 1044 1045 static enum wps_process_res wps_process_m8(struct wps_data *wps, 1046 const struct wpabuf *msg, 1047 struct wps_parse_attr *attr) 1048 { 1049 struct wpabuf *decrypted; 1050 struct wps_parse_attr eattr; 1051 1052 wpa_printf(MSG_DEBUG, "WPS: Received M8"); 1053 1054 if (wps->state != RECV_M8) { 1055 wpa_printf(MSG_DEBUG, "WPS: Unexpected state (%d) for " 1056 "receiving M8", wps->state); 1057 wps->state = SEND_WSC_NACK; 1058 return WPS_CONTINUE; 1059 } 1060 1061 if (wps_process_enrollee_nonce(wps, attr->enrollee_nonce) || 1062 wps_process_authenticator(wps, attr->authenticator, msg)) { 1063 wps->state = SEND_WSC_NACK; 1064 return WPS_CONTINUE; 1065 } 1066 1067 if (wps->wps->ap && wps->wps->ap_setup_locked) { 1068 /* 1069 * Stop here if special ap_setup_locked == 2 mode allowed the 1070 * protocol to continue beyond M2. This allows ER to learn the 1071 * current AP settings without changing them. 1072 */ 1073 wpa_printf(MSG_DEBUG, "WPS: AP Setup is locked - refuse " 1074 "registration of a new Registrar"); 1075 wps->config_error = WPS_CFG_SETUP_LOCKED; 1076 wps->state = SEND_WSC_NACK; 1077 return WPS_CONTINUE; 1078 } 1079 1080 decrypted = wps_decrypt_encr_settings(wps, attr->encr_settings, 1081 attr->encr_settings_len); 1082 if (decrypted == NULL) { 1083 wpa_printf(MSG_DEBUG, "WPS: Failed to decrypted Encrypted " 1084 "Settings attribute"); 1085 wps->state = SEND_WSC_NACK; 1086 return WPS_CONTINUE; 1087 } 1088 1089 if (wps_validate_m8_encr(decrypted, wps->wps->ap, attr->version2 != 0) 1090 < 0) { 1091 wpabuf_free(decrypted); 1092 wps->state = SEND_WSC_NACK; 1093 return WPS_CONTINUE; 1094 } 1095 1096 wpa_printf(MSG_DEBUG, "WPS: Processing decrypted Encrypted Settings " 1097 "attribute"); 1098 if (wps_parse_msg(decrypted, &eattr) < 0 || 1099 wps_process_key_wrap_auth(wps, decrypted, eattr.key_wrap_auth) || 1100 wps_process_creds(wps, eattr.cred, eattr.cred_len, 1101 eattr.num_cred, attr->version2 != NULL) || 1102 wps_process_ap_settings_e(wps, &eattr, decrypted, 1103 attr->version2 != NULL)) { 1104 wpabuf_free(decrypted); 1105 wps->state = SEND_WSC_NACK; 1106 return WPS_CONTINUE; 1107 } 1108 wpabuf_free(decrypted); 1109 1110 wps->state = WPS_MSG_DONE; 1111 return WPS_CONTINUE; 1112 } 1113 1114 1115 static enum wps_process_res wps_process_wsc_msg(struct wps_data *wps, 1116 const struct wpabuf *msg) 1117 { 1118 struct wps_parse_attr attr; 1119 enum wps_process_res ret = WPS_CONTINUE; 1120 1121 wpa_printf(MSG_DEBUG, "WPS: Received WSC_MSG"); 1122 1123 if (wps_parse_msg(msg, &attr) < 0) 1124 return WPS_FAILURE; 1125 1126 if (attr.enrollee_nonce == NULL || 1127 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1128 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1129 return WPS_FAILURE; 1130 } 1131 1132 if (attr.msg_type == NULL) { 1133 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1134 wps->state = SEND_WSC_NACK; 1135 return WPS_CONTINUE; 1136 } 1137 1138 switch (*attr.msg_type) { 1139 case WPS_M2: 1140 if (wps_validate_m2(msg) < 0) 1141 return WPS_FAILURE; 1142 ret = wps_process_m2(wps, msg, &attr); 1143 break; 1144 case WPS_M2D: 1145 if (wps_validate_m2d(msg) < 0) 1146 return WPS_FAILURE; 1147 ret = wps_process_m2d(wps, &attr); 1148 break; 1149 case WPS_M4: 1150 if (wps_validate_m4(msg) < 0) 1151 return WPS_FAILURE; 1152 ret = wps_process_m4(wps, msg, &attr); 1153 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1154 wps_fail_event(wps->wps, WPS_M4, wps->config_error, 1155 wps->error_indication); 1156 break; 1157 case WPS_M6: 1158 if (wps_validate_m6(msg) < 0) 1159 return WPS_FAILURE; 1160 ret = wps_process_m6(wps, msg, &attr); 1161 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1162 wps_fail_event(wps->wps, WPS_M6, wps->config_error, 1163 wps->error_indication); 1164 break; 1165 case WPS_M8: 1166 if (wps_validate_m8(msg) < 0) 1167 return WPS_FAILURE; 1168 ret = wps_process_m8(wps, msg, &attr); 1169 if (ret == WPS_FAILURE || wps->state == SEND_WSC_NACK) 1170 wps_fail_event(wps->wps, WPS_M8, wps->config_error, 1171 wps->error_indication); 1172 break; 1173 default: 1174 wpa_printf(MSG_DEBUG, "WPS: Unsupported Message Type %d", 1175 *attr.msg_type); 1176 return WPS_FAILURE; 1177 } 1178 1179 /* 1180 * Save a copy of the last message for Authenticator derivation if we 1181 * are continuing. However, skip M2D since it is not authenticated and 1182 * neither is the ACK/NACK response frame. This allows the possibly 1183 * following M2 to be processed correctly by using the previously sent 1184 * M1 in Authenticator derivation. 1185 */ 1186 if (ret == WPS_CONTINUE && *attr.msg_type != WPS_M2D) { 1187 /* Save a copy of the last message for Authenticator derivation 1188 */ 1189 wpabuf_free(wps->last_msg); 1190 wps->last_msg = wpabuf_dup(msg); 1191 } 1192 1193 return ret; 1194 } 1195 1196 1197 static enum wps_process_res wps_process_wsc_ack(struct wps_data *wps, 1198 const struct wpabuf *msg) 1199 { 1200 struct wps_parse_attr attr; 1201 1202 wpa_printf(MSG_DEBUG, "WPS: Received WSC_ACK"); 1203 1204 if (wps_parse_msg(msg, &attr) < 0) 1205 return WPS_FAILURE; 1206 1207 if (attr.msg_type == NULL) { 1208 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1209 return WPS_FAILURE; 1210 } 1211 1212 if (*attr.msg_type != WPS_WSC_ACK) { 1213 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1214 *attr.msg_type); 1215 return WPS_FAILURE; 1216 } 1217 1218 if (attr.registrar_nonce == NULL || 1219 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1220 { 1221 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1222 return WPS_FAILURE; 1223 } 1224 1225 if (attr.enrollee_nonce == NULL || 1226 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1227 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1228 return WPS_FAILURE; 1229 } 1230 1231 if (wps->state == RECV_ACK && wps->wps->ap) { 1232 wpa_printf(MSG_DEBUG, "WPS: External Registrar registration " 1233 "completed successfully"); 1234 wps_success_event(wps->wps); 1235 wps->state = WPS_FINISHED; 1236 return WPS_DONE; 1237 } 1238 1239 return WPS_FAILURE; 1240 } 1241 1242 1243 static enum wps_process_res wps_process_wsc_nack(struct wps_data *wps, 1244 const struct wpabuf *msg) 1245 { 1246 struct wps_parse_attr attr; 1247 u16 config_error; 1248 1249 wpa_printf(MSG_DEBUG, "WPS: Received WSC_NACK"); 1250 1251 if (wps_parse_msg(msg, &attr) < 0) 1252 return WPS_FAILURE; 1253 1254 if (attr.msg_type == NULL) { 1255 wpa_printf(MSG_DEBUG, "WPS: No Message Type attribute"); 1256 return WPS_FAILURE; 1257 } 1258 1259 if (*attr.msg_type != WPS_WSC_NACK) { 1260 wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type %d", 1261 *attr.msg_type); 1262 return WPS_FAILURE; 1263 } 1264 1265 if (attr.registrar_nonce == NULL || 1266 os_memcmp(wps->nonce_r, attr.registrar_nonce, WPS_NONCE_LEN != 0)) 1267 { 1268 wpa_printf(MSG_DEBUG, "WPS: Mismatch in registrar nonce"); 1269 wpa_hexdump(MSG_DEBUG, "WPS: Received Registrar Nonce", 1270 attr.registrar_nonce, WPS_NONCE_LEN); 1271 wpa_hexdump(MSG_DEBUG, "WPS: Expected Registrar Nonce", 1272 wps->nonce_r, WPS_NONCE_LEN); 1273 return WPS_FAILURE; 1274 } 1275 1276 if (attr.enrollee_nonce == NULL || 1277 os_memcmp(wps->nonce_e, attr.enrollee_nonce, WPS_NONCE_LEN != 0)) { 1278 wpa_printf(MSG_DEBUG, "WPS: Mismatch in enrollee nonce"); 1279 wpa_hexdump(MSG_DEBUG, "WPS: Received Enrollee Nonce", 1280 attr.enrollee_nonce, WPS_NONCE_LEN); 1281 wpa_hexdump(MSG_DEBUG, "WPS: Expected Enrollee Nonce", 1282 wps->nonce_e, WPS_NONCE_LEN); 1283 return WPS_FAILURE; 1284 } 1285 1286 if (attr.config_error == NULL) { 1287 wpa_printf(MSG_DEBUG, "WPS: No Configuration Error attribute " 1288 "in WSC_NACK"); 1289 return WPS_FAILURE; 1290 } 1291 1292 config_error = WPA_GET_BE16(attr.config_error); 1293 wpa_printf(MSG_DEBUG, "WPS: Registrar terminated negotiation with " 1294 "Configuration Error %d", config_error); 1295 1296 switch (wps->state) { 1297 case RECV_M4: 1298 wps_fail_event(wps->wps, WPS_M3, config_error, 1299 wps->error_indication); 1300 break; 1301 case RECV_M6: 1302 wps_fail_event(wps->wps, WPS_M5, config_error, 1303 wps->error_indication); 1304 break; 1305 case RECV_M8: 1306 wps_fail_event(wps->wps, WPS_M7, config_error, 1307 wps->error_indication); 1308 break; 1309 default: 1310 break; 1311 } 1312 1313 /* Followed by NACK if Enrollee is Supplicant or EAP-Failure if 1314 * Enrollee is Authenticator */ 1315 wps->state = SEND_WSC_NACK; 1316 1317 return WPS_FAILURE; 1318 } 1319 1320 1321 enum wps_process_res wps_enrollee_process_msg(struct wps_data *wps, 1322 enum wsc_op_code op_code, 1323 const struct wpabuf *msg) 1324 { 1325 1326 wpa_printf(MSG_DEBUG, "WPS: Processing received message (len=%lu " 1327 "op_code=%d)", 1328 (unsigned long) wpabuf_len(msg), op_code); 1329 1330 if (op_code == WSC_UPnP) { 1331 /* Determine the OpCode based on message type attribute */ 1332 struct wps_parse_attr attr; 1333 if (wps_parse_msg(msg, &attr) == 0 && attr.msg_type) { 1334 if (*attr.msg_type == WPS_WSC_ACK) 1335 op_code = WSC_ACK; 1336 else if (*attr.msg_type == WPS_WSC_NACK) 1337 op_code = WSC_NACK; 1338 } 1339 } 1340 1341 switch (op_code) { 1342 case WSC_MSG: 1343 case WSC_UPnP: 1344 return wps_process_wsc_msg(wps, msg); 1345 case WSC_ACK: 1346 if (wps_validate_wsc_ack(msg) < 0) 1347 return WPS_FAILURE; 1348 return wps_process_wsc_ack(wps, msg); 1349 case WSC_NACK: 1350 if (wps_validate_wsc_nack(msg) < 0) 1351 return WPS_FAILURE; 1352 return wps_process_wsc_nack(wps, msg); 1353 default: 1354 wpa_printf(MSG_DEBUG, "WPS: Unsupported op_code %d", op_code); 1355 return WPS_FAILURE; 1356 } 1357 } 1358
